linux-kernel - Re: sem_lock() vs qspinlocks

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Message-ID: <20160520083008.GD3193@twins.programming.kicks-ass.net>
Date:	Fri, 20 May 2016 10:30:08 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Davidlohr Bueso <dave@...olabs.net>
Cc:	manfred@...orfullife.com, Waiman.Long@....com, mingo@...nel.org,
	torvalds@...ux-foundation.org, ggherdovich@...e.com,
	mgorman@...hsingularity.net, linux-kernel@...r.kernel.org
Subject: Re: sem_lock() vs qspinlocks

On Thu, May 19, 2016 at 10:39:26PM -0700, Davidlohr Bueso wrote:
> Specifically
> for the 'cascade_cond' and 'cascade_flock' programs, which exhibit hangs in libc's
> semop() blocked waiting for zero.

OK; so I've been running:

while :; do
  bin/cascade_cond -E -C 200 -L -S -W -T 200  -I 2000000 ;
  bin/cascade_flock -E -C 200 -L -S -W -P 200 -I 5000000 ;
done

for a few minutes now and its not stuck and my machine didn't splat.

Am I not doing it right?